I hear ya. Although it'd damn near kill him to have to place Bonham at number two. :-)

Damned if I can rank them - this one had more influence, that one sold more records, this one has more groove, that one more feel, this one is more of master of the instrument, that one's more flashy and dynamic, this one more musical, that one more versatile, this one more creative, that one has such a great sound, etc etc etc

Not so easy to judge things from the top of the hill when you're at the bottom either ... not that that stops people from pretending they can ...